CN104858362A - Regeneration technology of foundry used sand - Google Patents
Regeneration technology of foundry used sand Download PDFInfo
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- CN104858362A CN104858362A CN201510219940.4A CN201510219940A CN104858362A CN 104858362 A CN104858362 A CN 104858362A CN 201510219940 A CN201510219940 A CN 201510219940A CN 104858362 A CN104858362 A CN 104858362A
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Abstract
The invention relates to a regeneration technology of foundry used sand. The technology comprises the following steps that (1), initial magnetic separation is carried out on broken used sand; (2) the broken used sand obtained after initial magnetic separation is roasted; (3), roasted sand grains are cooled, and under the negative pressure condition, blast grinding is carried out on the sand grains; and (4), the ground sand grains are screened, magnetic separation is carried out again, and regeneration sand is obtained. The quality of the regenerated sand obtained through the technology treatment is further improved, the acid consumption value and the ignition losses of the sand are obviously reduced, the sand grain and the resin coating effect is better, the strength is higher, the pollution of the used sand to the environment is reduced, the cost of core making materials of a casting enterprise is saved, and a hot core box and a cold core box made of original sand can be completely replaced.
Description
Technical field
The present invention relates to a kind of regeneration technology of cast used sand, belong to casting old-sand regeneration technical field.
Background technology
Existing casting old-sand regeneration processing procedure carries out magnetic separation usually to remove magnetisable material before roasting, but the remaining organic matter owing to being mingled with in cast used sand, have impact on suction magnetic, cause magnetisable material to be difficult to thoroughly be removed.Meanwhile, present inventor finds under study for action, and in subsequent high temperature heat treatment process, sand grain surface often can adhere to one deck irony film, and also has little iron shot in the micropore of core (type) inside; Therefore, the reclaimed sand inferior quality that existing casting old-sand regeneration technique obtains, wherein still containing a large amount of magnetic impurities.And due to the existence of these magnetic impurities, cause reclaimed sand to prepare in cold core or hot core process, sour consumption value is comparatively large, affects the effect of cold core catalyst and the covered effect of sand grains and resin, reduce the intensity of core, therefore cannot completely for the manufacture of hot box and cold-box.
Summary of the invention
In order to solve the problem, the invention provides a kind of new casting old-sand regeneration technique.Gained reclaimed sand quality better, when preparing cold core or hot core further with it, its sour consumption value, burning decrement obviously reduce, and sand grains and resin-coating better effects if, intensity is higher, has both reduced the pollution of old sand to environment, again saves the cost that foundry enterprise makes core material.The reclaimed sand obtained through the method for the invention can substitute roughing sand manufacture hot box and cold-box completely.
To achieve these goals, the present invention adopts following technical scheme:
A regeneration technology for cast used sand, comprises the steps:
1) old sand after fragmentation is carried out first magnetic separation;
2) old sand after first magnetic separation is carried out roasting;
3) by the sand grains cooling after roasting, under condition of negative pressure, mechanical lapping (air blast grinding) is carried out;
4) by the sand grains screening after grinding, magnetic separation again, obtains reclaimed sand.
Roasting combines with air blast grinding technics by the present invention, and increase the magnetic separation of first and last secondary, effectively remove impurity in reclaimed sand, improve the quality of reclaimed sand, gained reclaimed sand can completely for the manufacture of hot box and cold-box, significant for the cost saving foundry enterprise Modeling Material.
In step 3 of the present invention) in, described mechanical lapping simulation desert wind sand forming process, be specially: in the bottom Continuous aeration air blast of grinder, continue to bleed at the top of grinder simultaneously, thus in grinder, form air-flow sand grains seethed with excitement, and in grinder Stress control at-4 ~-5KPa.Wherein, air blast pressure is 4 ~ 6KPa.Compare the mechanical grinding methods such as conventional rollers grinding, the dying embers on old sand surface, irony film and the little iron thin film be absorbed in sand grains hollow can thoroughly be peeled off by the Ginding process adopting simulation desert wind sand of the present invention to be formed, and impurity-eliminating effect is more remarkable.
In step 1 of the present invention) in, the magnetic induction intensity of described magnetic separation is 2000 ~ 4000 Gausses.
In step 2 of the present invention) in, described roasting technique condition: temperature is 500 ~ 800 DEG C, roasting time is 5 ~ 6 hours; Those skilled in the art know, and roasting condition is selected improperly to have a strong impact on roasting effect, and temperature is too low, and impurity cannot complete reaction, but temperature is higher, causes again regeneration cost to increase; Roasting time is too short, cannot utilize waste heat, and overlong time, can production efficiency be affected again.Present inventor determines best roasting condition through great many of experiments, under this roasting technique condition, in sand grains, impurity organic matter is adequately broken, and releasing heat, waste heat is utilized to reduce fuel cost, and in wriggling process slowly, also the abundant calcination of organic impurities at sand grains hollow place can be fallen.
In step 3 of the present invention) in, the described type of cooling is water spray cooling mode; By sand grains chilling temperature to 130 DEG C ~ 150 DEG C, be more conducive to the separation of organic impurities and the prolongation in grinder service life.
In step 4 of the present invention) in, the magnetic induction intensity of described magnetic separation is again 5000 ~ 15000 Gausses, preferably 10000 ~ 13000 Gausses.The present invention utilizes the magnetic separation process of first and last twice varying strength, has both ensured that in reclaimed sand, impurity is thoroughly separated, and again saves production cost.Particle diameter after screening is 30 ~ 270 orders; Be 2 ~ 5T/h to sand amount, to sand thickness <3mm.
In the present invention, the equipment that the techniques such as described magnetic separation, roasting, mechanical lapping use is this area common equipment.
Present invention also offers the reclaimed sand adopting above-mentioned technique obtained.
Adopt the reclaimed sand that regeneration technology of the present invention obtains, its quality is able to further lifting, when using it for manufacture hot box and cold-box, its sour consumption value, burning decrement obviously reduce, sand grains and resin-coating effective, intensity is high, thus reduces the pollution of old sand to environment, save the cost that foundry enterprise makes core material, roughing sand can be substituted completely and manufacture hot box and cold-box.
Accompanying drawing explanation
Fig. 1 is the reclaimed sand that existing regeneration technology obtains.
Fig. 2 is the reclaimed sand that the embodiment of the present invention 1 obtains.
Fig. 3 is the impurity that the embodiment of the present invention 1 processes.
Detailed description of the invention
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
As the preferred embodiment of the present invention, the regeneration technology of described cast used sand, comprises the steps:
1) old sand after fragmentation is carried out first magnetic separation; The magnetic induction intensity of described magnetic separation is 2000 ~ 4000 Gausses;
2) old sand after first magnetic separation is carried out roasting; Described roasting technique condition: temperature is 500 ~ 800 DEG C, roasting time is 5 ~ 6 hours;
3) by the sand grains cooling after roasting, under condition of negative pressure, air blast grinding is carried out;
Described mechanical lapping simulation desert wind sand forming process, is specially: in the bottom Continuous aeration air blast of grinder, continues to bleed simultaneously at the top of grinder, thus in grinder, forms air-flow sand grains is seethed with excitement, and Stress control is at-4 ~-5KPa.Wherein, air blast pressure is 4 ~ 6KPa.
The described type of cooling is water spray cooling mode; Sand grains is cooled to 130 DEG C ~ 150 DEG C, is more conducive to the separation of organic impurities and the prolongation in grinder service life.
4) by the sand grains screening after grinding, magnetic separation again, obtains reclaimed sand.The magnetic induction intensity of described magnetic separation is again 5000 ~ 15000 Gausses, preferably 10000 ~ 13000 Gausses.Particle diameter after screening is 30 ~ 270 orders; Be 2 ~ 5T/h to sand amount, to sand thickness <3mm.
Embodiment 1
A regeneration technology for cast used sand, comprises the steps:
1) old sand after fragmentation is carried out first magnetic separation, remove the thick shape magnetisable material be mixed in old sand; The magnetic induction intensity of described magnetic separation is 3000 Gausses;
2) old sand after first magnetic separation is carried out roasting; Described roasting technique condition: temperature is 700 DEG C, roasting time is 5.5 hours;
3) the sand grains water smoke after roasting is cooled to 130 DEG C, in the bottom Continuous aeration air blast of grinder, simultaneously continue to bleed at the top of grinder, thus in grinder, form air-flow sand grains is seethed with excitement, and Stress control is at-4.5KPa, the impurity such as the dying embers produced when removing sand grain surface roasting;
4) sand grains after grinding is sieving through magnetic separation again after 20 orders; The magnetic induction intensity of magnetic separation is 12000 Gausses again, is 3T/h to sand amount, to sand thickness 2mm.
Embodiment 2
Adopt the method for embodiment 1 to prepare reclaimed sand, difference is:
1) step 2) in sintering temperature be 500 DEG C, roasting time is 5 hours;
2) step 3) middle mechanical milling tech condition: form-4KPa negative pressure in grinder;
3) step 4) in the magnetic induction intensity of magnetic separation be 10000 Gausses, be 5T/h to sand amount,
To sand thickness 3mm.
Embodiment 3
Adopt the method for embodiment 1 to prepare reclaimed sand, difference is:
1) step 2) in sintering temperature be 800 DEG C, roasting time is 6 hours;
2) step 3) middle mechanical milling tech condition: form-5KPa negative pressure in grinder;
3) step 4) in the magnetic induction intensity of magnetic separation be 13000 Gausses, be 2T/h to sand amount,
To sand thickness 1mm.
Comparative example 1
Adopt regeneration technology as described in Example 1 to prepare reclaimed sand, difference is, omits step 4).
Comparative example 2
Adopt regeneration technology as described in Example 1 to prepare reclaimed sand, difference is, omits step 1).
Comparative example 3
Adopt regeneration technology as described in Example 1 to prepare reclaimed sand, difference is, step 3) in, adopt conventional grinding wheels grinding, grinding condition is rotating speed 800 ~ 1600r/min, and the spacing of emery wheel and cylinder is 2 ~ 5mm.
Compliance test result is tested
According to GB/T2684-2009 standard, embodiment 1 ~ 3, comparative example 1-3 gained reclaimed sand are manufactured cold core, and detect wherein sour consumption value, burning decrement and intensity, result is as shown in the table:
| Sand mold | Comparative example 1 | Comparative example 2 | Comparative example 3 | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Acid consumption value ml | 8.6 | 7.3 | 7.5 | 5.6 | 6.0 | 4.7 |
| Burning decrement % | 0.17 | 0.15 | 0.13 | 0.08 | 0.10 | 0.05 |
| Intensity MPa | 0.61 | 0.82 | 0.87 | 1.13 | 1.06 | 1.32 |
As seen from table, for the regeneration of old sand, its magnetic separation operation arrange order, mechanical lapping method for regeneration effect impact significantly.Only just magnetic separation before roasting, the acid consumption value of reclaimed sand, burning decrement are higher, and intensity is poor; And only magnetic separation after grinding, although the acid consumption value of reclaimed sand, burning decrement have decline, intensity is also improved, and effect is not remarkable.Adopt embodiment 1 ~ 3 gained reclaimed sand of the method for the invention, it obviously reduces preparing sour consumption value and burning decrement in cold core and hot core process, and intensity significantly improves.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (10)
1. a regeneration technology for cast used sand, is characterized in that, comprises the steps:
1) old sand after fragmentation is carried out first magnetic separation;
2) old sand after first magnetic separation is carried out roasting;
3) by the sand grains cooling after roasting, under condition of negative pressure, mechanical lapping is carried out;
4) by the sand grains screening after grinding, magnetic separation again, obtains reclaimed sand.
2. regeneration technology according to claim 1, it is characterized in that, step 3) in, described mechanical lapping is specially: at the bottom Continuous aeration of grinder, continue to bleed at the top of grinder simultaneously, thus in grinder, form air-flow sand grains is seethed with excitement, and Stress control is at-4 ~-5KPa.
3. regeneration technology according to claim 1 and 2, is characterized in that, step 1) in, the magnetic induction intensity of described magnetic separation is 2000 ~ 4000 Gausses.
4. regeneration technology according to claim 1 and 2, is characterized in that, step 2) in, described roasting technique condition: temperature is 500 ~ 800 DEG C, roasting time is 5 ~ 6 hours.
5. regeneration technology according to claim 1 and 2, is characterized in that, step 3) in, the described type of cooling is water spray cooling mode; Chilling temperature to 130 DEG C ~ 150 DEG C.
6. regeneration technology according to claim 1 and 2, is characterized in that, step 4) in, the magnetic induction intensity of described magnetic separation is again 5000 ~ 15000 Gausses.
7. regeneration technology according to claim 6, is characterized in that, the magnetic induction intensity of described magnetic separation is again 10000 ~ 13000 Gausses.
8. regeneration technology according to claim 1 and 2, is characterized in that, step 4) in, the particle diameter after screening is 30 ~ 270 orders, is 2 ~ 5T/h to sand amount, to sand thickness <3mm.
9. regeneration technology according to claim 1, is characterized in that, comprises the steps:
1) old sand after fragmentation is carried out first magnetic separation; The magnetic induction intensity of described magnetic separation is 2000 ~ 4000 Gausses;
2) old sand after first magnetic separation is carried out roasting; Described roasting technique condition: temperature is 500 ~ 800 DEG C, roasting time is 5 ~ 6 hours;
3) by the sand grains cooling after roasting, under condition of negative pressure, air blast grinding is carried out;
Be specially: in the bottom Continuous aeration air blast of grinder, simultaneously continue to bleed at the top of grinder, thus in grinder, form air-flow sand grains is seethed with excitement, and Stress control is at-4 ~-5KPa;
The described type of cooling is water spray cooling mode; Sand grains is cooled to 130 DEG C ~ 150 DEG C, is more conducive to the separation of organic impurities and the prolongation in grinder service life;
4) by the sand grains screening after grinding, magnetic separation again, obtains reclaimed sand; The magnetic induction intensity of described magnetic separation is again 5000 ~ 15000 Gausses; Particle diameter after screening is 30 ~ 270 orders; Be 2 ~ 5T/h to sand amount, to sand thickness <3mm.
10. the reclaimed sand that the arbitrary described regeneration technology of claim 1 ~ 9 is obtained.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107008851A (en) * | 2017-04-10 | 2017-08-04 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand and organic sand mixed regeneration method and its reclaimed sand |
| CN107457352A (en) * | 2017-08-15 | 2017-12-12 | 合肥正明机械有限公司 | A kind of renovation process for casting mixing old sand |
| CN107649643A (en) * | 2017-09-11 | 2018-02-02 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
| CN107983909A (en) * | 2017-12-26 | 2018-05-04 | 合肥仁创铸造材料有限公司 | The method of water mist processing casting reclaimed sand |
| CN108136487A (en) * | 2015-10-15 | 2018-06-08 | 新东工业株式会社 | The regeneration method and regenerative system of sand |
| CN108326230A (en) * | 2018-03-26 | 2018-07-27 | 江苏翔晟重工有限公司 | A kind of reclamation technique |
| CN109226668A (en) * | 2018-11-21 | 2019-01-18 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand regeneration method |
| CN109822044A (en) * | 2019-01-31 | 2019-05-31 | 宁波华铸环保科技有限公司 | A kind of reclaimed sand production line |
| CN110814276A (en) * | 2019-12-06 | 2020-02-21 | 马鞍山市绿科环保科技有限公司 | Method for cleaning impurities in casting waste sand |
| CN111468673A (en) * | 2020-04-24 | 2020-07-31 | 南阳仁创砂业科技有限公司 | Regeneration method of used foundry sand |
| CN113134567A (en) * | 2021-04-20 | 2021-07-20 | 柳晶（长春）环保科技有限公司 | Regeneration method of mixed waste sand of inorganic waste sand and green mould waste sand and regenerated sand |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN115533022A (en) * | 2022-12-05 | 2022-12-30 | 承德北雁新材料科技有限公司 | Regeneration method of foundry clay mixed used sand containing resin organic binder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108136487A (en) * | 2015-10-15 | 2018-06-08 | 新东工业株式会社 | The regeneration method and regenerative system of sand |
| RU2715138C2 (en) * | 2015-10-15 | 2020-02-25 | Синтокоджио, Лтд. | Method for regeneration of molding sand and regeneration system |
| EP3363558A4 (en) * | 2015-10-15 | 2019-06-05 | Sintokogio, Ltd. | Molding sand regeneration method and regenerating system |
| CN107008851A (en) * | 2017-04-10 | 2017-08-04 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand and organic sand mixed regeneration method and its reclaimed sand |
| CN107008851B (en) * | 2017-04-10 | 2019-10-18 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand and organic sand mixed regeneration method and its reclaimed sand |
| CN107457352A (en) * | 2017-08-15 | 2017-12-12 | 合肥正明机械有限公司 | A kind of renovation process for casting mixing old sand |
| CN107457352B (en) * | 2017-08-15 | 2019-12-31 | 宣城创玺铸造有限公司 | Regeneration method of casting mixed used sand |
| CN107649643B (en) * | 2017-09-11 | 2019-11-15 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
| CN107649643A (en) * | 2017-09-11 | 2018-02-02 | 齐鲁工业大学 | A kind of regenerating used method of selective laser sintering mound precoated sand |
| CN107983909A (en) * | 2017-12-26 | 2018-05-04 | 合肥仁创铸造材料有限公司 | The method of water mist processing casting reclaimed sand |
| CN108326230A (en) * | 2018-03-26 | 2018-07-27 | 江苏翔晟重工有限公司 | A kind of reclamation technique |
| CN109226668A (en) * | 2018-11-21 | 2019-01-18 | 合肥仁创铸造材料有限公司 | A kind of inorganic sand regeneration method |
| CN109822044A (en) * | 2019-01-31 | 2019-05-31 | 宁波华铸环保科技有限公司 | A kind of reclaimed sand production line |
| CN110814276A (en) * | 2019-12-06 | 2020-02-21 | 马鞍山市绿科环保科技有限公司 | Method for cleaning impurities in casting waste sand |
| CN111468673A (en) * | 2020-04-24 | 2020-07-31 | 南阳仁创砂业科技有限公司 | Regeneration method of used foundry sand |
| CN111468673B (en) * | 2020-04-24 | 2021-06-25 | 南阳仁创砂业科技有限公司 | Regeneration method of used foundry sand |
| CN113134567A (en) * | 2021-04-20 | 2021-07-20 | 柳晶（长春）环保科技有限公司 | Regeneration method of mixed waste sand of inorganic waste sand and green mould waste sand and regenerated sand |
| CN114101577A (en) * | 2021-11-24 | 2022-03-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN114101577B (en) * | 2021-11-24 | 2023-12-29 | 北京仁创砂业铸造材料有限公司 | Regeneration method of casting 3D printing waste sand |
| CN115533022A (en) * | 2022-12-05 | 2022-12-30 | 承德北雁新材料科技有限公司 | Regeneration method of foundry clay mixed used sand containing resin organic binder |
| CN115533022B (en) * | 2022-12-05 | 2023-03-14 | 承德北雁新材料科技有限公司 | Regeneration method of foundry clay mixed used sand containing resin organic binder |
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